Gasifier combustor

Abstract

The invention relates to a combustor used for a gasifier and started and preheated by adopting combustible gas as fuel. The gasifier combustor is characterized in that a central tube, an inner tube, a middle tube and an outer tube are sequentially arranged at the center of the combustor from inside to outside, and medium channels are formed in the space among the ignition rod and the tubes and includes an ignition fuel gas channel, an ignition oxidant channel, a starting-up fuel gas channel and a starting-up oxidant channel. The gasifier combustor is characterized in that the central tube and the ignition rod are arranged inside the inner tube which is connected with a stable-combustion device; the ignition is arranged in the position capable of avoiding being combusted and eroded by high-temperature flame; the stable-combustion device forms a partial combustion chamber for ignition fuel gas, so that ignition flame can combust reliably, ignition of starting-up fuel gas can be ensured to be successful, and ignition reliability and starting-up flame stability can be guaranteed; shielding gas is replaced during starting up, so that internal and external pressure can be balanced, high-temperature flue gas cannot backflow to the channels of the combustor, and service life of the combustor is prolonged.

Description

Technical field [0001] The invention relates to a burner for a gasification furnace, in particular to a burner for the start-up preheating of a gasification furnace. Background technique [0002] In the existing coal gasification plant, the main fuel is mostly dry coal powder or coal water slurry. Regardless of the physical state of the coal, the success rate of directly igniting it with a high-temperature flame is low. At present, the more mature ignition scheme is "three-stage ignition". The process is as follows: firstly, the gas fuel which is easy to catch fire is directly ignited in the ignition burner to form a high-temperature flame, and the starting burner is ignited by the flame, and The gasifier boosts the load, and finally preheats the gasifier to a high temperature and medium pressure state, and then feeds coal through the process burner. The coal enters the gasifier and encounters high temperature environment and oxidant and ignites spontaneously after reaching ignit...

AI Technical Summary

Problems solved by technology

At present, in order to prevent the ablation problem of the ignition rod in the industry, a movable ignition rod is used. When the ignition rod is working, it extends out of the burner, and when it is not working, it shrinks into the inside of the burner. This ignition method has high investment costs, complicated operation, and high temperature The sealing problem under high pressure is also more difficult to solve

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